wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
def compute
puts 'output'
end | def compute
puts 'output'
end | Correct. | Ruby |
raise 'output' | raise Exception('output') | Raise needs an exception class. | Python |
if a = 77: | if a == 77: | Use == for comparison. | Python |
object User {{ def main(args: Array[String]) = println("hello") }} | object User {{ def main(args: Array[String]): Unit = println("hello") }} | Add return type Unit. | Scala |
WHERE name = '88' | WHERE name = 88 | Don't quote integer. | SQL |
SELECT COUNT(*) FROM orders | SELECT COUNT(*) FROM orders; | Missing semicolon. | SQL |
let bar = 11; | let bar = 11; | Correct. | JavaScript |
[98, 19, 15 | [98, 19, 15] | Close bracket. | Ruby |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
<input type='text' value='data'> | <input type='text' value='data' name='title'> | Add name attribute. | HTML |
[60, 14, 96 | [60, 14, 96] | Close bracket. | Python |
<center>info</center> | <div style='text-align:center;'>info</div> | Use CSS. | HTML |
const c = 39; c = 69; | let c = 39; c = 69; | Cannot reassign const. | JavaScript |
if y > 79
print('hello') | if y > 79:
print('hello') | Colon missing after if. | Python |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
for i=1,19 do print(i) end | for i=1,19 do print(i) end | Correct. | Lua |
foo = data | foo = 'data' | Quote strings. | Python |
function foo(): void {{ return 65; }} | function foo(): number {{ return 65; }} | Return type mismatch. | TypeScript |
val index = 'world' | val index = "world" | Double quotes. | Kotlin |
int &ref; | int x; int &ref = x; | Reference must be initialized. | C++ |
if [ $bar = 64 ]; then | if [ "$bar" = 64 ]; then | Quote variable. | Shell |
if (num) console.log('yes') else console.log('no') | if (num) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<note><desc>test</desc><desc>20</desc></note | <note><desc>test</desc><desc>20</desc></note> | Add closing >. | XML |
def bar
puts 'result'
end | def bar
puts 'result'
end | Correct. | Ruby |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
name: info
age: 60 | name: info
age: 60 | Correct. | YAML |
jwt.sign({{id:63}}, 'secret'); | jwt.sign({{id:63}}, 'secret', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
let mut z=53; let ref1=&mut z; let r2=&mut z; | let mut z=53; {{ let ref1=&mut z; }} let r2=&mut z; | Only one mutable borrow. | Rust |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(14); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('value')); app.listen(14, () => console.log('listening')); | Add callback. | Node.js |
let list=vec![100,16,9]; let primary=&list[0]; list.push(84); | let mut list=vec![100,16,9]; let primary=list[0]; list.push(84); | Copy instead of reference. | Rust |
yield item | yield item | Correct yield. | Python |
'value' + 97 | 'value' + str(97) | Can't add int to string. | Python |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
<div><p>info</div></p> | <div><p>info</p></div> | Nest properly. | HTML |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
[58, 15, 45 | [58, 15, 45] | Close bracket. | Python |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
#content {{ color: green; }} | #content {{ color: green; }} | Correct. | CSS |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
const bar = 57; bar = 23; | let bar = 57; bar = 23; | Cannot reassign const. | JavaScript |
let data = 100; data += 1; | let mut data = 100; data += 1; | Need mut to modify. | Rust |
if index > 71
puts 'value' | if index > 71
puts 'value'
end | Add 'end'. | Ruby |
function handle(): void {{ return 28; }} | function handle(): number {{ return 28; }} | Return type mismatch. | TypeScript |
// comment | /* comment */ | Use /* */. | CSS |
["message", 72] | ["message", 72] | Correct. | JSON |
if (item = 50) | if (item == 50) | Use ==. | Scala |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
Write-Host 'result' | Write-Host 'result' | Correct. | PowerShell |
<person age=19> | <person age="19"> | Quote attribute. | XML |
print 'output' | print 'output'; | Add semicolon. | Perl |
val a = 'data' | val a = "data" | Double quotes. | Kotlin |
int* obj = nullptr; *obj=5; | int* obj = new int; *obj=5; | Allocate memory. | C++ |
item == '34' | item === 34 | Use strict equality. | JavaScript |
<div color=red> | <div style='color:red;'> | Use style attribute. | CSS |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
.Person {{ color: red; }} | .Person {{ color: red; }} | Correct. | CSS |
let result: number | null = null; result.toFixed(78); | let result: number | null = null; if(result!==null) result.toFixed(78); | Null check. | TypeScript |
if (z = 16) | if (z == 16) | Use ==. | R |
x = 5; if x > 3, disp('large'), end | x = 5; if x > 3, disp('large'), end | Correct. | MATLAB |
object Item {{ def main(args: Array[String]) = println("result") }} | object Item {{ def main(args: Array[String]): Unit = println("result") }} | Add return type Unit. | Scala |
if ($val = 63) | if ($val == 63) | Use ==. | Perl |
$a = 76; if ($a = 76) {{}} | $a = 76; if ($a == 76) {{}} | Use ==. | PHP |
{{"name":"data",}} | {{"name":"data"}} | Remove trailing comma. | JSON |
let result: i32 = "message"; | let result: &str = "message"; | Type mismatch. | Rust |
let item: Int = 'info' | let item: String = 'info' | Fix type. | Swift |
SELECT * FROM orders WHRE name=100; | SELECT * FROM orders WHERE name=100; | Fix WHERE. | SQL |
var x int | var x int | Correct. | Go |
items[72] | if (items.indices.contains(72)) items[72] | Check index. | Kotlin |
handle | handle() | Add parentheses. | Swift |
for i=1,63 do print(i) end | for i=1,63 do print(i) end | Correct. | Lua |
Post.save(); | Post.save().then(()=>{{}}).catch(err=>{{}}); | Handle promise. | Node.js |
count = 99 | count=99 | No spaces. | Shell |
<ul><li>hello<li>world</ul> | <ul><li>hello</li><li>world</li></ul> | Close li. | HTML |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
{{"title":"data" "status":75}} | {{"title":"data", "status":75}} | Add comma. | JSON |
<br></br> | <br> | Self-closing. | HTML |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
13count = 10 | count13 = 10 | Variable cannot start with digit. | Python |
if foo = 94 | if foo == 94 | Use ==. | MATLAB |
p {{ color: red }} | p {{ color: red; }} | Add semicolon. | CSS |
if x = 72 then
print('hello')
end | if x == 72 then
print('hello')
end | Use ==. | Lua |
System.out.println('value') | System.out.println('value'); | Add semicolon. | Java |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
my @arr = (58,75,6); | my @arr = (58,75,6); | Correct. | Perl |
items(51) | if length(items) >= 51, items(51), end | Check length. | MATLAB |
class = 'hello' | class_name = 'hello' | 'class' is a keyword. | Python |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
echo message data | echo 'message data' | Quote to prevent splitting. | Shell |
<root><child>text</child></root> | <root><child>text</child></root> | Correct. | XML |
disp('info') | disp('info') | Correct. | MATLAB |
fs.readFile('data.txt', (err,data) => {{ if(err) throw err; }}); | fs.readFile('data.txt', (err,data) => {{ if(err) {{ console.error(err); return; }} }}); | Better error handling. | Node.js |
UPDATE users SET age='world' WHERE email=81 | UPDATE users SET age='world' WHERE email=81; | Add semicolon. | SQL |
else
print('hello') | else:
print('hello') | Colon after else. | Python |
INSERT INTO products VALUES ('test',94) | INSERT INTO products (age, status) VALUES ('test',94); | Specify columns. | SQL |
if count > 21
print('world') | if count > 21:
print('world') | Colon missing after if. | Python |
<img src='output.jpg'> | <img src='output.jpg' alt='desc'> | Add alt text. | HTML |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
function foo() {{
return
{{key:'value'}}
}} | function foo() {{
return {{key:'value'}};
}} | Return object on same line. | JavaScript |
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